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authorJan Kara <jack@suse.cz>2014-10-02 05:49:46 +0400
committerTheodore Ts'o <tytso@mit.edu>2014-10-02 05:49:46 +0400
commitd6320cbfc92910a3e5f10c42d98c231c98db4f60 (patch)
treecbb8eeb01f8974e14b0342e5fdcbabf099a3b304 /fs/ext4
parent90a8020278c1598fafd071736a0846b38510309c (diff)
downloadlinux-d6320cbfc92910a3e5f10c42d98c231c98db4f60.tar.xz
ext4: fix mmap data corruption when blocksize < pagesize
Use truncate_isize_extended() when hole is being created in a file so that ->page_mkwrite() will get called for the partial tail page if it is mmaped (see the first patch in the series for details). Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/inode.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d5dd7d46844e..091845298f48 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4514,8 +4514,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
ext4_orphan_del(NULL, inode);
goto err_out;
}
- } else
+ } else {
+ loff_t oldsize = inode->i_size;
+
i_size_write(inode, attr->ia_size);
+ pagecache_isize_extended(inode, oldsize, inode->i_size);
+ }
/*
* Blocks are going to be removed from the inode. Wait